bug#33380: 27.0.50; Emacs hangs in current-time-zone

[Sam Steingold <sds@gnu.org>]

In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin17.7.0, NS
appkit-1561.60 Version 10.13.6 (Build 17G3025))
 of 2018-11-12 built on C-6111-SSTEINGO
Repository revision: db711687c3983eda60275dadcc4dc75119e6c0ae
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.6

When I hit `d` in Calendar, Emacs hangs, and debug-on-quit reveals the
backtrace:

Debugger entered--Lisp error: (quit)
  current-time-zone(-242240400)
  calendar-next-time-zone-transition((-3852 1873))
  calendar-dst-find-data((-3852 1873))
  calendar-dst-find-startend(1962)
  calendar-dst-starts(1962)
  eval((calendar-dst-starts year))
  dst-in-effect(716571.289583333)
  dst-adjust-time((11 27 1962) 6.94794218501546)
  solar-sunrise-sunset((11 27 1962))
  solar-sunrise-sunset-string((11 27 1962))
  diary-sunrise-sunset()
  eval((diary-sunrise-sunset))
  diary-sexp-entry("(diary-sunrise-sunset)" "" (11 27 1962))
  diary-list-sexp-entries((11 27 1962))
  diary-list-entries((11 27 1962) 1)
  diary-view-entries(1)
  funcall-interactively(diary-view-entries 1)
  call-interactively(diary-view-entries nil nil)
  command-execute(diary-view-entries)

this does not happen with "current" dates.


-- 
Sam Steingold <http://sds.podval.org> <http://www.childpsy.net>
<http://steingoldpsychology.com>